change impeller 35hp super seahorse

[jhromeli]

Hi every one , I am rebuilding a 1959 super seahorse 35 hp , so far I have done points , fix the exhaust plate, new sparks, the engine starts real good at the first time ater 15 years of storage , but i have been Reading a lot in the forum and every one said its very important to change the impeller , in the pee hole i have a moderate good flow of water , so i order the Impeller , and I start today the job , I have a manual , so I thought its going to be a easy job after all I have done, Wrong, first thing I found the three screws of the water pump they were stock , because they were carbon steel, so I have to blew the screws and make a new threads for ? in. , change the impeller and put the pump back , I took the thermostat off , to make sure it is working the pump, I start the engine , no water , I check the key , it is in the correct position , I check the water tubes , they were in correct position , also the main shaft , since it moves the propeller , I took everything out , re check , put it back , no water , the water tubes looks dry in the inside.
One of my question is , does the impeller have correct position , I put it to work in a counter clock wise , is it correct?.
I am thinking about the water level in the barrel i put water until the suction plate , should i put water until the height of the water pump, to prime it ?
What else I am missing.
Thanks every one , sorry about my english.

 

[Willyclay]

Re: change impeller 35hp super seahorse

I am thinking about the water level in the barrel i put water until the suction plate , should i put water until the height of the water pump, to prime it ?

Yes, try again but with water level higher without covering the exhaust relief hole. Good luck with that great old motor!

 

[nimmor]

Re: change impeller 35hp super seahorse

Several years ago I purchased a 59 35 and started the restoration project. Replaced the impellor and couldn't get water pressure. I then replaced the grommets and I could not believe the water pressure. The grommets are the rubber fittings that the copper tubes from the pump go into to to create a water tight fit. You should have 4 of them, 2 on the pump and 2 on the motor. After time the grommets dry rot and develop cracks and will not allow water pressure to build. Hope that helps.

 

[jhromeli]

Re: change impeller 35hp super seahorse

Hi, yesterday i work in the motor and I did this.
1) I put a higher level of water in the barrel , no success.
2) I took the lower unit out again , and with garden hose I put water in the cooper tubes , i took the thermostat cover out and i found i have water at this point and no leakage inside the cooper tubes , that lead me to the pump.
3) I don?t know what else to do , this is a real simple system, and what I see the pump it is not working, could it be the direction of the impeller , when you turn the shaft by hand , it will turn only counterclockwise, clockwise is real hard ?
4) the key in the shaft is correct in the impeller , i double check
any advice.
Thanks to all

 

[CATransplant]

Re: change impeller 35hp super seahorse

Your engine runs clockwise. The arms of the impeller should be trailing when you turn the driveshaft clockwise.

 

[jhromeli]

Re: change impeller 35hp super seahorse

Thanks CATransplant, I think my engine works counterclockwise , at least the magneto flywheel it is the way it turns when working, should i change the impeller to turn clockwise?

 

[F_R]

Re: change impeller 35hp super seahorse

Even if you put them in backwards, they will flip over.

I suspect you are leaking air into the intake side of the pump--especially since you did such major work on the screws.

 

[F_R]

Re: change impeller 35hp super seahorse

AND/Or, do you have the thermostat and the plastic housing with the check valve installed? Leave that stuff out, and it will suck air down through the return tube to the pump.

 

[lindy46]

Re: change impeller 35hp super seahorse

Looking down from the top. the flywheel turns clockwise when the motor is running. That shouldn't make any difference to the impeller - even if installed with the vanes in the wrong direction, they should "right" themselves once the engine is running.

 

[jhromeli]

Re: change impeller 35hp super seahorse

Thanks everyone, yesterday i blow air from the top of the thermostat , and i got bubbles in the water , I have the plastic housing and the check valve installed and working, how do i test the pump outside the engine?
I dont know what else to do..

 

[Willyclay]

Re: change impeller 35hp super seahorse

No way to check one without being installed that I know. Biggest issue is verification that impeller is engaged on shaft key prior to installing impeller housing. Good luck!

 

[jhromeli]

Re: change impeller 35hp super seahorse

hi every one , thanks for all the replays, i took the LU to a OMC mechanic , he saids he found that the housing is damaged, i didnt saw that way, but I am trying to find a new one, does any one knows the correct part number , i check at marineengine.com manual and I found this part number 377533 but they didnt have it , also iboats store doesnt have, i check in ebay and also in google for this part number , but nothing.
Please help. this pump have 2 water tubes is for 1959 Johnson Seahorse RDS21
Thanks to all

 

[Willyclay]

Re: change impeller 35hp super seahorse

i check at marineengine.com manual and I found this part number 377533 but they didnt have it , also iboats store doesnt have, Thanks to all

That is the correct ORIGINAL part number. When I entered that number into the marineengine.com parts system, the response was: new part number 0378348. They show 10+ in inventory at $131.00 each. I searched iboats.com store for it but could not find it. Here's a link to the OMC Parts catalog if you need it:

http://www.marineengine.com/parts/v...ntage-evinrude-johnson/377809/37780900001.htm

I also owned an RDS-21 motor and ran it for ten years mostly in saltwater. Had to replace the impeller several times over those years and never had any problems. I did replace the "plate" below the impeller once due to damage from sand/silt, however, it was pumping water okay BEFORE the replacement. In my opinion, the housing would have to be badly damaged for it not to be pumping ANY water. Unless it has a hole in it, I would expect it to still pump water even if the interior surface is badly eroded. I hope F_R or one of the other experts jump in after this because I am NOT an expert, just an old guy who has been fooling with outboards for 50+ years. Hate to see you spend more money on new parts that may not be necessary!

I recall that Forum Moderator Tashasdaddy had the experience of several BAD new impellers right out of the box for a late 50's J&E35 he was working on a few years ago. I think his self-destructed as soon as he started the motor. I think his experience reminds us to check our new impeller very carefully. You might want to re-install the "old" one and see what happens. Sorry I cannot be more help. Hang in there and you will solve the problem. It is usually the simple little things that we overlook or forget. Good luck!

 

[jhromeli]

Re: change impeller 35hp super seahorse

Hi everyone , just to finish , I finally found the problem. The problem was in the screws that I remade the threads , the one in the bottom it wasn?t seating correct the pump housing, after this fix I have a fountain of water in the thermostat.
Thanks everybody for the advice.

 

[Willyclay]

Re: change impeller 35hp super seahorse

I suspect you are leaking air into the intake side of the pump--especially since you did such major work on the screws.

As usual, F_R is on top of the problem! Thanks for posting the results. I hope that great old motor continues to run for another 50 years.